EXAMPLE A) Declaring a function in sum.sh script:

#!/usr/bin/bash

sum()
{
   echo $1 + $2 | bc
}

# call function and pass cli
# parameters to function
sum $1 $2

Calling script:

[aesteban@localhost ~]$ ./sum.sh 1.4 1.3
2.7

EXAMPLE B) A different way to write sum.sh script:

#!/usr/bin/bash

sum()
{
   RESULT=$(echo $1+$2 | bc) # or: RESULT=`echo $1+$2 | bc`
}

sum $1 $2

echo $RESULT

Calling modified script:

[aesteban@localhost ~]$ ./sum.sh 1.7 1.2
2.9

EXAMPLE C) Another way to write the same crap:

#!/usr/bin/bash

sum()
{
   echo $1+$2 | bc
}

SUMRESULT=`sum $1 $2`

echo $SUMRESULT

Calling it:

[aesteban@localhost ~]$ ./sum.sh 2.9 3
5.9

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